Many states around the nation are trying to enact laws to restrict carbon emissions, and industries too numerous to mention have begun making changes hoping to be fully prepared to comply with laws they haven’t seen yet. Congress is considering laws in hopes that they can avoid having EPA impose its own version of CO2 restrictions.

Before jumping on this bandwagon, we should be certain that we understand the science. U.S. Climate Action Report 2010, 5th ed. might be understood by some Americans to be the definitive word; however nary a word in the report even pretends to

establish a link between CO2 and putative global warming

show that the increase in CO2 concentration is due to human activity instead of natural causes (such as natural warming of the oceans)

show that either an increase in CO2 concentration or an increase in temperature is, on balance, bad (or worse than laws restricting CO2 emissions) or

I write in regard to the Proposed Endangerment and Cause or Contribute Findings for Greenhouse Gases Under Section 202(a) of the Clean Air Act, Proposed Rule, 74 Fed. Reg. 18,886 (Apr. 24, 2009), the so-called “Endangerment Finding.”

It has been often said that the “science is settled” on the issue of CO2 and climate. Let me put this claim to rest with a simple one-letter proof that it is false.

The letter is s, the one that changes model into models. If the science were settled, there would be precisely one model, and it would be in agreement with measurements.

Alternatively, one may ask which one of the twenty-some models settled the science so that all the rest could be discarded along with the research funds that have kept those models alive. We can take this further. Not a single climate model predicted the current cooling phase. If the science were settled, the model (singular) would have predicted it.